Joel,
Your solution only works in a single JVM architecture. What if you have your
components spread over many JVM's?
You need a singleton logging service in this context.
-Chris.
> -----Original Message-----
> From: Joel Crisp [SMTP:[EMAIL PROTECTED]]
> Sent: Tuesday, November 23, 1999 9:24 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Java implementation Query:Urgent
>
> Hi
>
> Both of these solutions are BAD !
>
> You should implement a queue which can take multiple threads writing log
> objects
> to the queue. You can do this without synchronization using the atomic
> features
> of the java language calculations and volatile variables. Then use one
> thread
> to pull the log objects of the queue and write them to the file.
>
> Locking on a shared object will bottleneck your performance, and JNI is
> discouraged
> in EJBs.
>
> Joel Crisp, Senior Java Architect, SUN PS Java Center (UK)
>
> Srinivasan VS wrote:
> >
> > Hi
> >
> > If multiple applications are writing on to the same file, you might need
> to
> > implement the writing using JNI (C does provided for opening a file in
> > mutually exclusive mode). I dont
> > think Java allows opening a file in mutually exclusive mode.
> >
> > If multiple threads of the same application are writing to the same
> file,
> > you might consider getting locks on a shared object.
> >
> > Hope this helps
> > srini
> > ----- Original Message -----
> > From: Sanjay Nambiar <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Saturday, November 20, 1999 4:52 AM
> > Subject: Java implementation Query:Urgent
> >
> > > Hi All,
> > > Sorry to post this mail on this mailing list.But if some one could
> provide
> > a
> > > solution.....
> > > We have "probably" a preliminary query.
> > > In our application we would like to write to one log file by multiple
> > > processes.The problem we are facing is as follows:
> > > We have to implement one log class which would be static and a method
> of
> > > that class would be called by the respective
> > > applications.
> > >
> > > During writing to the file, the messages are being Garbled as shown
> below.
> > > Error Num Insert query is as follows:"....."
> > > Where the string "Error Num" actually is a complete string "Error
> Number
> > is
> > > :100 ISAM Query" .
> > >
> > > This is because multiple applications are trying to write to the file
> at
> > the
> > > same time.
> > > We have implemented RandomAccessFile.Method is
> > RandomAccessFile.WriteBytes()
> > > We request for a solution in terms of brief pointers or a detailed
> > solution.
> > >
> > > Regards,
> > > SANJAY Nambiar
> > >
> > >
> >
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> > >
> > >
> >
> >
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